Untrack redundant .gitignore files.
Tidy up pom.xml.

Remove redundant dependencies, replace tabs with spaces und remove false
tags.
Add support for broken JDBC drivers.

Some JDBC drivers don't return a ParameterMetaData object but instead
throw an exception. This is a temporary fix until DBUtils 1.6.1 / 1.7
fixes DBUTILS-117 to handle those situations.